p80c550efaa NXP Semiconductors, p80c550efaa Datasheet - Page 6

• Manufacturer Part Number: p80c550efaa
• Description: 80c51 8-bit Microcontroller Family 4k/128 Otp/rom/romless, Channel Watchdog Timer
• Manufacturer: NXP Semiconductors

* SFRs are bit addressable.
# SFRs are modified from or added to the 80C51 SFRs.
**This value is not valid for a masked ROM part (83C550) when running from internal memory (EA = 1). See data sheet for details.
Philips Semiconductors
Table 1.
1998 May 01
ACC*
ADAT#
ADCON#
B*
DPTR:
IP*#
IE*#
P0*
P1*
P2*
P3*
PCON#
PSW*
SBUF
SCON*
SP
TCON*
TMOD
TH0
TH1
TL0
TL1
WDCON*#
WDL#
WFEED1#
WFEED2#
SYMBOL
DPH
DPL
80C51 8-bit microcontroller family
4K/128 OTP/ROM/ROMless, 8 channel 8 bit A/D, watchdog timer
Accumulator
A/D result
A/D control
B register
Data pointer
Interrupt priority
Interrupt enable
Port 0
Port 1
Port 2
Port 3
Power control
Program status word
Serial data buffer
Serial port control
Stack pointer
Timer counter/control
Timer/counter mode
Timer 0 high byte
Timer 1 high byte
Timer 0 low byte
Timer 1 low byte
Watchdog timer
control
Watchdog timer
reload
Watchdog timer
feed 1
Watchdog timer
feed 2
8XC550 Special Function Registers
High byte
Low byte
DESCRIPTION
(2 bytes):
ADDRESS
DIRECT
C6H
C5H
D0H
8CH
8DH
C0H
C1H
C2H
C3H
E0H
F0H
83H
82H
B8H
A8H
80H
90H
A0H
B0H
87H
99H
98H
81H
88H
89H
8AH
8BH
MSB
SMOD
GATE
PRE2
SM0
TF1
BF
AF
EA
D7
CY
C7
E7
F7
A7
B7
9F
8F
87
97
–
–
BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION
PRE1
PWD
EWD
SIDL
SM1
TR1
C/T
BE
AE
AC
E6
F6
A6
B6
D6
9E
8E
C6
86
96
–
PRE0
PAD
EAD
SM2
6
TF0
BD
AD
M1
E5
A5
B5
D5
9D
8D
C5
F5
85
95
F0
–
–
ADCI
REN
RS1
TR0
BC
PS
AC
ES
M0
E4
F4
A4
B4
D4
9C
8C
C4
84
94
–
–
ADCS
GATE
GF1
RS0
PT1
ET1
TB8
IE1
BB
AB
D3
C3
E3
F3
83
93
A3
B3
9B
8B
–
80C550/83C550/87C550
AADR2
WDRUN
PX1
EX1
GF0
RB8
C/T
OV
IT1
E2
BA
AA
A2
B2
D2
9A
8A
C2
F2
82
92
AADR1
WDTOF
PT0
ET0
PD
IE0
M1
D1
C1
E1
F1
B9
A9
81
91
A1
B1
99
89
TI
–
AADR0 xxx00000B
WDMOD
PX0
EX0
LSB
B 0
IDL
IT0
M0
Product specification
E0
F0
B8
A8
A0
D0
C0
80
90
98
RI
88
P
00H
xxH
00H
00H
00H
x0000000B
00H
FFH
FFH
FFH
FFH
00xx0000B
00H
xxH
00H
07H
00H
00H
00H
00H
00H
00H
00H
000xx000B**
FFH**
xxH
xxH
RESET
VALUE